Bear in mind that, at the age of sixteen, she helps reform and lead the DA and gets imprisoned in Malfoy Manor, where she is probably tortured. When she is freed by the Power Trio, she'd be excused for going into hiding, but she returns to Hogwarts for the final battle and fights Bellatrix Lestrange.

I think it could be a subtrope of Crouching Moron Hidden Badass, and deserves its own trope. Add River from Firelfly in Live-Action TV, and it might get many other examples later on and be accepted. Good Luck !

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